Photosynthetic responses and proline content of mature and young leaves of sunflower plants under water deficit |
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Authors: | I. Cechin S. C. Rossi V. C. Oliveira T. F. Fumis |
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Affiliation: | (1) Department of Biology, Faculty of Science, Sao Paulo State University, 17033-360 Bauru-SP, Brazil |
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Abstract: | In mature and young leaves of sunflower (Helianthus annuus L. cv. Catissol-01) plants grown in the greenhouse, photosynthetic rate, stomatal conductance, and transpiration rate declined during water stress independently of leaf age and recovered after 24-h rehydration. The intercellular CO2 concentration, chlorophyll (Chl) content, and photochemical activity were not affected by water stress. However, non-photochemical quenching increased in mature stressed leaves. Rehydration recovered the levels of non-photochemical quenching and increased the Fv/Fm in young leaves. Drought did not alter the total Chl content. However, the accumulation of proline under drought was dependent on leaf age: higher content of proline was found in young leaves. After 24 h of rehydration the content of proline returned to the same contents as in control plants. |
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Keywords: | chlorophyll drought intercellular CO2 concentration leaf water potential non-photochemical quenching photochemical activity rehydration stomatal conductance to water vapour transpiration rate |
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